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LEASES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020
Lessee, Operating Sublease, Description [Abstract]
Remaining lease terms	13 years
2023, sublease payments due to Company	$ 4.9
2024, sublease payments due to Company	3.3
2025, sublease payments due to Company	2.8
2026, sublease payments due to Company	2.9
2027, sublease payments due to Company	$ 2.7
Impairment loss		$ 2.5

X

- Definition

Lessee, Operating Sublease, Asset, Payments, Due Year Five

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Lessee, Operating Sublease, Asset, Payments, Due Year Four

+ References

No definition available.

+ Details

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X

- Definition

Lessee, Operating Sublease, Asset, Payments, Due Year Three

+ References

No definition available.

+ Details

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X

- Definition

Lessee, Operating Sublease, Asset, Payments, Due Year Two

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Lessee, Operating Sublease, Asset, Payments, Next Twelve Months

+ References

No definition available.

+ Details

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Namespace Prefix:	hmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Operating And Finance Lease, Remaining Lease Terms

+ References

No definition available.

+ Details

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Namespace Prefix:	hmst_
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

+ Details

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